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44.6 Use of boundary-layer formulas. Air at 1 atm and 20C flows tangentially on both sides of a thin, smooth flat plate of width W
44.6 Use of boundary-layer formulas. Air at 1 atm and 20C flows tangentially on both sides of a thin, smooth flat plate of width W = 10 ft, and of length L = 3 ft in the direction of the flow. The velocity outside the boundary layer is constant at 20 ft/s. (a) Compute the local Reynolds number Rex = XV./v at the trailing edge. (b) Assuming laminar flow, compute the approximate boundary-layer thickness, in inches, at the trailing edge. Use the results of Example 4.4-1. (c) Assuming laminar flow, compute the total drag of the plate in lb. Use the results of Exam- ples 4.4-1 and 2
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